Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f739e94f5535332…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bd43fdc645df6d96df29fb7cbe8e551 SHA-1: a46d1fb3204411e121bfa4c32c7c5247b4dfb3aa SHA-256: 6f739e94f5535332715ca987b99e554b6ae246891eff2a487cc5e9162e2d1584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=lg+cassette+air+conditioner+service+manual PDF link annotation
    • https://cochleartudaskozpont.hufiles/gigonofebobiped.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/39404496130.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077050fbb6a9---figoragefafize.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085a39f7f447---xurujanisi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/14359223835.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/zomebesileli.pdfIn PDF document text
    • https://motoralbini.it/files/file/jakukasexive.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e882787a63e---dusapinojemawitisosasif.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/wuxusad.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d989070cf7---22718776516.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0as09nnue12bvuhilve99n29ve/zavem.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0f507ef976a60847a62449944852f26/lusokuzikorepod.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xadipazebe.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/16819503798.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0fecc3f4---lupinadilimaluliziluwodu.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35394026791.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/125f5f3b38251c89e9a5c0c962a4fa93/88350157453.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/61603368460.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a605961f5bb6c2e9f9bdeb45360e451f/wagagikikeku.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7sbgm5qh6hh906qf6co60antnn/12163341295.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ok7nmr0r0d0a8jkd0tppll9bd7/rabunat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10836 bytes
SHA-256: 9befc55d7b9899e0f423f2c06a7cfba6ee8ab9a71c80f0714557f003d3b08c8a
font_01_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 18632 bytes
SHA-256: 9b7e83afb52c0d3838da2fa671f6afb68f5dad203a591e89ce8b4202bf66f6d7

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